The study will include 30 patients and randomize them in a 1:1-fashion to either a training or a usual care group. The training group will undergo 8 weeks of combined endurance and resistance training according to a standard protocol, but with individual adjustment if required. The usual care group will receive general advice but no structured exercise program. Exercise capacity is assessed by cardiopulmonary exercise testing and by the 6 minute walk test prior to and after the intervention period. In addition, life quality will be assessed by validated questionnaires, while safety will be assessed by recording adverse events and by echocardiography.